PSU made with power op-amp and small trafo - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 9th July 2003, 03:34 PM   #1
Banned
 
Join Date: Mar 2003
Location: Lisbon, Portugal
Question PSU made with power op-amp and small trafo

Guys, I've been thinking...
Correct me if I'm wrong (I love to say this ) on my thoughts.

What I have in mind is from a small and cheap transformer (say, 2x24v/1A) make a good PSU for a GC.

The transformer would at the same time supply the power op-amp and the non-iniverting input.
That is, V+ connected to +IN on one power op-amp.
The other one would have the V- connected to +IN.
On the output of one op-amp you would have + voltage, and on the other one you would have the negative.
The voltage would be the same, because an op-amp won't swing more voltage than it has on the PSU supplying it, no matter what gain you configure it.
I was thinking in OPA541, for instance.
It's unity-gain stable.

My doubt, and the question here, is if I would have more current on the output than the current the transformer has (1A).
Wouldn't it be nice to have a 10A PSU (with OPA541) with a 1A transformer?

Am I dreaming?
  Reply With Quote
Old 9th July 2003, 03:38 PM   #2
tiroth is offline tiroth  United States
diyAudio Member
 
Join Date: Dec 2001
Location: Pittsburgh, PA, USA
Quote:
Am I dreaming?
Yup. Nothing is free. Rail sag will limit your current. Of course due to losses it will be even more limited than a passive supply.

You are essentially using the opamp as a regulator.
  Reply With Quote
Old 9th July 2003, 04:01 PM   #3
Banned
 
Join Date: Mar 2003
Location: Lisbon, Portugal
Talking Thanks tiroth

Thanks for awaking me from a nice dream.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
ARC SP6 (B) power-trafo (trade?) Cobra2 Swap Meet 3 23rd March 2011 09:13 PM
Power trafo... Psychobiker Tubes / Valves 4 25th October 2007 07:52 AM
Power supply options.. bigger trafo with less caps or medium trafo with heavy caps? rhythmdiy Chip Amps 9 23rd October 2007 12:30 AM
18V or 36VCT Small Trafo wanted Zero Cool Swap Meet 3 7th April 2005 10:48 PM
Help!! Ive made it too small!! johndory Multi-Way 13 14th September 2004 10:36 AM


New To Site? Need Help?

All times are GMT. The time now is 04:55 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2